Listed battery company Redflow Limited (ASX: RFX) has reached a production milestone now that its brand new batteries are ready for shipment to customers.

The ZBM2 batteries, using battery stacks made in its new Thailand factory, are designed for use in residential, telecommunications, commercial and industrial along with grid-scale energy storage.

The battery stack is the critical part of the Redflow ZBM2 zinc-bromine flow battery, with electrodes that charge the battery by depositing zinc on a membrane and discharging it by reversing that process.

This marks yet another milestone for Redflow who is competing against a number of massive players in the battery storage sector, including Elon Musk's Tesla batteries.

The Thai-made battery stacks are being installed on existing ZBM2 battery 'tank sets' in the company's Brisbane headquarters, but the company hopes to be manufacturing and testing complete batteries in Thailand by June.

The CEO of Redflow, Richard Aird, says completing the batteries with Thai-made battery stacks was an important moment for the company.

"Our first requirement of the new factory is quality components, which it is now producing in the electrode stack - the most complex and critical part of our product," says Aird.

"Our pre-delivery tests have confirmed that these complete batteries, using Thai-made stacks and existing battery tank sets, perform to standard."

The company's ZMB2 battery is a unique energy storage system which delivers 100 per cent depth of discharge every day for a warranted 10 years without causing any damage to the battery.

Redflow says the battery can be stored at any stage of charge, from fully to empty, for years. When needed, the battery starts within 30 seconds ready to deliver 100 per cent of its stored energy.

The company has also made the battery internet-ready for remote access, and it captures data in real-time to allow for 24/7 remote monitoring from smartphone and computer devices.

Shares in Redflow are up 7.69 per cent to $0.14 per share at 12.06pm AEDT.